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Cassiopeia A
New evidence from Chandra suggests that the neutron star at the center of the Cas A supernova remnant has an ultra-thin carbon atmosphere. This uniform carbon atmosphere would explain the lack of X-ray pulsations from this object because the neutron star would be unlikely to display any changes as it rotates. The absence of pulsations has been a mystery since the neutron star was discovered in Chandra’s “First Light” image over a decade ago. The carbon atmosphere is thought to be only about four inches thick, with a density similar to diamond and a pressure more than ten times that found at the center of the Earth.